scholarly journals OPERATIONALANALYSIS OF MECHANICAL CUT-TO-LENGTH FOREST HARVESTING SYSTEM

2017 ◽  
Vol 41 (3) ◽  
Author(s):  
Nilton Cesar Fiedler ◽  
Flávio Cipriano de Assis do Carmo ◽  
Luciano José Minette ◽  
Amaury Paulo de Souza
Keyword(s):  
Operational Efficiency ◽  
Forest Harvesting ◽  
Mechanical Parameters ◽  
Operational Analysis ◽  
The Third ◽  
Time And Motion ◽  
Eucalypt Plantations ◽  
Motion Studies ◽  
Third Shift ◽  
Auxiliary Activities

ABSTRACT The objective of this research was to conduct an operational analysis of forest harvesting activities in a mechanized of the system cut to length in eucalypt plantations in south of Bahia, to determine the distribution of operation times, productivity, operational efficiency and mechanical availability of two models of harvester and two models of forwarder, evaluating these machines in three modules harvesting methodology through time and motion studies. Auxiliary activities corresponded to the lowest percentages within the operating times (mean 1.9% to 1.8% for harvester and forwarder), already operating activities were those that had the highest percentages. The first shift was presented the worst results of operations for the harvester (average 66.3%) and the third shift for the forwarder (55.5%). For the harvester module 1 showed the best result of productive times (average 70.36%). In relation to the forwarder, this same module showed the worst results with unproductive times (average of 22.17%). The availability and mechanical parameters were superior productivity for the forwarder (mean 82.31% and 51.33 m3/h, respectively), as indicators of degree of utilization and operational efficiency were higher in harvester (average 85.01% and 66.41%, respectively). Thus, for the forwarder, the parameters mechanical availability and productivity were higher, while for the harvester, they were the indicators of degree of utilization and operational efficiency

scholarly journals The Costs of Home-Based ART Initiation and Mobile Refill in Uganda

2017 ◽  
Vol 4 (suppl_1) ◽  
pp. S436-S436
Author(s):  
D Allen Roberts ◽  
Stephen Asiimwe ◽  
Bosco Turyamureeba ◽  
Ruanne Barnabas
Keyword(s):  
Large Scale ◽  
Viral Suppression ◽  
Geographic Area ◽  
Outreach Worker ◽  
Eligibility Criteria ◽  
Time And Motion Studies ◽  
Art Initiation ◽  
Time And Motion ◽  
Home Based ◽  
Motion Studies

Abstract Background Antiretroviral therapy (ART) is effective at reducing HIV-associated morbidity, mortality, and transmission, but 20 million people who meet WHO eligibility criteria for ART are not in care. While decentralized care is a promising strategy to expand ART access, the costs of implementing a community-based model on a large scale remain unknown. Methods The DO-ART study is a randomized trial of community- vs. clinic-centered ART delivery in South Africa and Uganda using 12-month viral suppression as the primary outcome. We evaluated the costs of home-based ART initiation and refill in southwest Uganda using time-and-motion studies, staff interviews, and budgetary analysis. Costs categories included medications, supplies, personnel, building and utilities, start-up, vehicles, and community mobilization. We used a programmatic perspective with a 3% discount rate and removed research-associated costs. Results The largest cost categories included medications, supplies, and salaries, constituting 41%, 27%, and 17% of the total cost, respectively. Time-and-motion studies revealed that each outreach worker could serve an average of three patients per day in a fully decentralized model. In a scenario of providing home-based ART to 1400 patients aross seven sub-counties, the yearly per-patient cost was estimated to be $304 (2016 USD), which is similar to literature reports of the costs of facility-based ART provision. Conclusion These estimates suggest that home-based ART may be a realistic delivery option, especially if it is found to be effective at improving viral suppression. Further research is needed to evaluate how this intervention can most efficiently scale to provide widespread ART access over a large geographic area. Disclosures All authors: No reported disclosures.

scholarly journals PERANAN KETELADANAN ORANG TUA DALAM MEMBENTUK KEPRIBADIAN DAN AKHLAK ANAK DI SDN CIBULUH 02 BOGOR UTARA

2018 ◽  
Vol 1 (1) ◽  
pp. 31-104
Author(s):  
Amalliah Kadir
Keyword(s):  
Qualitative Research ◽  
Time Management ◽  
Role Model ◽  
Sampling Method ◽  
Good Time ◽  
Time And Motion ◽  
Role Of Parents ◽  
Motion Studies ◽  
Good Behaviour

This research was conducted to examine more deeply the role ofparents in shaping personality, morals and any factors that becomeobstacles and supporters in shaping children's personality and moralsin SDN 02 Cibuluh Bogor Utara. It is a qualitative research with datacollection methods (observation, interview, documentation), thenanalyzed using descriptive methods (by recording and reviewing allresults of data obtained from various sources, case studies, comparativestudies, time and motion studies, behavior analysis) and the object ofthis research was chosen by purposive sampling method. The results ofthis study get clarity that the importance of the role of parents inshaping personality, including: good time management, smile,greetings, and familiarize good behaviour. The role of parents inshaping morality includes: always remember to die, fear of Allah,always reminding that everything we have can not be taken into theafterlife-world except our valuable knowledge that we had done in life,shadaqah jariyah, and the prayer of the good children. The importantrole of parents is as the child companion, as a preacher and qudwahhasanah (good role model), controller, motivator, mediator, technicalmanager of children in every process of child development, especiallyin aspects of personality and morals.  

Evaluating the Operational Efficiency of Two Versions of Super Diverging Diamond Interchange Design: A Case Study in Denver, Colorado

2021 ◽  
pp. 036119812110372
Author(s):  
Muhammad Tahmidul Haq ◽  
Amirarsalan Mehrara Molan ◽  
Khaled Ksaibati
Keyword(s):  
Research Effort ◽  
Traffic Signals ◽  
Operational Efficiency ◽  
Traffic Demand ◽  
Operational Analysis ◽  
Signal Coordination ◽  
Traffic Volumes ◽  
Microsimulation Models ◽  
Better Than

This paper aims to advance the current research on the new super diverging diamond interchange (super DDI) design by evaluating the operational efficiency using real-world locations. As part of a comprehensive research effort on improving the performance of failing service interchanges in the mountain-plains region, the study identified three interchanges (Interstate 225 and Mississippi Avenue, Interstate 25 and 120th Avenue, and Interstate 25 and Hampden Avenue) at Denver, Colorado as the potential candidates to model for future retrofit. Four interchange designs (i.e., existing CDI [conventional diamond interchange], DDI, super DDI-1, and super DDI-2) were tested in this study. The operational analysis was conducted using VISSIM and Synchro. Several microsimulation models (120 scenarios with 600 runs in total) were created with three peak hours (a.m., noon, and p.m.) for existing (the year 2020) and projected (the year 2030) traffic volumes. The study considered two simulation networks: (1) when no adjacent traffic signal exists, to determine how the four interchange designs would perform if there were no adjacent signals or they were far away from the interchange; and (2) when there are two adjacent traffic signals, to evaluate the performance of the four interchanges in a bigger corridor with signal coordination needed. An important finding is that super DDI designs outperformed DDI with adjacent signals and higher traffic demand, while DDI performed similarly to or sometimes insignificantly better than super DDI if no adjacent intersections were located in the vicinity and if the demand was lower than the DDI’s capacity.

The Third Shift:

2002 ◽  
pp. 251-265
Author(s):  
Naomi Gerstel
Keyword(s):  
The Third ◽  
Third Shift

scholarly journals The “Third Shift”: A Path Forward to Recognizing and Funding Gender Equity Efforts

2020 ◽  
Vol 29 (11) ◽  
pp. 1359-1360
Author(s):  
Lekshmi Santhosh ◽  
Bridget P. Keenan ◽  
Shikha Jain
Keyword(s):  
Gender Equity ◽  
The Third ◽  
Third Shift

scholarly journals The Profitability of Cross-Cutting Practices in Butt-Rotten Picea abies Final-Felling Stands

Forests ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 874 ◽  
Author(s):  
Kärhä ◽  
Räsänen ◽  
Palander
Keyword(s):  
Picea Abies ◽  
Norway Spruce ◽  
Processing Time ◽  
Wood Quality ◽  
Study Data ◽  
Heterobasidion Annosum ◽  
Time And Motion ◽  
The Cross ◽  
Motion Studies ◽  
The Impact

Research Highlights: This study offers new information on the cross cutting of decayed stems with the sounding of short (0.5 m) offcuts and the bucking of longer (3.0 m) butt-rotten poles. Background and Objectives: The root and butt-rot fungus Heterobasidion annosum sensu lato (Fr.) Bref. causes wood quality damage to trees in softwood forests. When timber is harvested in butt-rotten forests, it is essential that the decayed part of the tree is recognized and cut away from a stem, while the healthy and good quality log section of a stem is cross cut with precision sawlogs. The objective of the study was to investigate the impact of two off-cutting methods on stem processing time, cutting productivity, sawlog volume, and commercial value at the roadside landing when harvesting timber from the butt-rotten Norway spruce (Picea abies (L.) Karst.) final-felling forests. Materials and Methods: The length of the short offcuts used was 0.5 m. The results of the cross-cutting practices were compared to the decayed pulpwood poles of 3 m from the butt of the rotten stems. Time and motion studies were carried out in stands before the profitability calculations. The study data consisted of 1980 Norway spruce sawlog stems. Results: Sounding of the short offcuts added significantly to the stem processing time of butt-rotten stems, but the sawlog volume and the timber value recovery of the stems were higher than those of the decayed pulpwood poles of 3 m. Conclusions: The study concluded that sounding of butt-rotten Norway spruce stems with one to three offcuts is economically profitable if the diameter of the decayed column at the stem stump’s height is small (≤5 cm). In contrast, when the width of the decay is larger (>5 cm), it is more profitable to first cross cut the decayed pulpwood pole of 3 m and then to observe the height of the decayed part of the stem.

scholarly journals Optimization of a forest harvesting set based on the Queueing Theory: Case study from Karelia

2015 ◽  
Vol 61 (4) ◽  
pp. 211-220 ◽  
Author(s):  
Ilya Shegelman ◽  
Pavel Budnik ◽  
Evsey Morozov
Keyword(s):  
Queueing Theory ◽  
Timber Harvesting ◽  
Operational Efficiency ◽  
Forest Harvesting ◽  
Set Design ◽  
Optimal Harvesting ◽  
Queueing Model ◽  
Modeling Methods ◽  
The Republic

Abstract The modern technological process of timber harvesting is a complex system both technically and organizationally. Nowadays, the study of such systems and improvement of their efficiency is impossible without the use of mathematical modeling methods. The paper presents the methodology for the optimization of logging operations based on the queueing theory. We show the adapted queueing model, which characterizes the process of logging with the use of a harvesting set consisting of harvesters and forwarders. We also present the experimental verification of the designated model that confirmed mode’s adequacy. The analysis of the effectiveness of the investigated harvesting set was conducted and the recommendations for its optimization were drawn. The research was conducted in the Pryazhinsky District in the Republic of Karelia. We showed that significant improvement of operational efficiency of the investigated harvesting set in the study area cannot be done by adjusting separate machine operations (i.e. by reducing the time of operations execution and their steadiness). However, a change in the number of machines allowed significant improvement in the operational efficiency. The most optimal harvesting set design for the experimental area consisted of two harvesters and two forwarders.

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